openstack CLI does not support OS_PASSWORD containing curly brackets

[Pierre Riteau]

When a user has a password containing curly brackets and specifies it via OS_PASSWORD, the openstack CLI fails with confusing errors:

    $ export OS_PASSWORD='abcd{efgh'
    $ openstack server list
    unmatched '{' in format

    $ export OS_PASSWORD='abcd}efgh'
    $ openstack server list
    Single '}' encountered in format string

    $ export OS_PASSWORD='abcd{}efgh'
    $ openstack server list
    tuple index out of range

    $ openstack --version
    openstack 3.12.0

It works fine if the password is provided via clouds.yaml or when prompted by `openstack` in the absence of the OS_PASSWORD variable.

[Cory Wright (corywright)]

This is affecting our openstack installation as well.

[Cory Wright (corywright)]

It fails for us both when passed via the `OS_PASSWORD` environment variable and also when passed via `--os-password` on the command line.